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Equilibrium, kinetics and thermodynamics of adsorption of cadmium in aqueous solution by modified biomass ash

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Document pages: 9 pages

Abstract: Natural biomass ash from agricultural residues collected from power plants was modified with hexagonal mesoporous silica and functionalized with 3-aminopropyl triethoxysilane. The physicochemical and morphological characteristics of biomass ash were analyzed by ICP-OES, SEM, tem-eds, FTIR and bet. The adsorption behavior of the modified product for Cd2 + in aqueous solution with pH, initial metal concentration, equilibrium time and temperature was studied. The results showed that the specific surface area of the modified product was 9 times that of natural biomass ash. The modified biomass ash showed high affinity for Cd2 +, and its adsorption capacity increased sharply with the increase of pH value from 4.0 to 6.0. The maximum adsorption capacity is 23.95 mg g in the sol with pH 5tion with an initial metal concentration of 50 mg L and a contact time of 90 min. The adsorption of Cd2+ onto the modified biomass ash was well fitted to the Langmuir model and it followed pseudo-second-order kinetics. Thermodynamic analysis results showed that the adsorption of Cd2+ was spontaneous and endothermic in nature. The results suggest that the modified biomass ash is promising for use as an inexpensive and effective adsorbent for Cd2+ removal from aqueous solution.

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